不同温度下天然橡胶扭拉热效应分析

弹热制冷是由应力场驱动弹热材料相变而产生制冷效应的固态制冷技术.天然橡胶由于价格低廉,弹性模量较小而备受关注.本文在0℃以上的环境温度对硫化天然橡胶进行拉伸-加捻-解捻-回缩循环消除Mullins效应,并在环境温度为-30～40℃范围内对消除了Mullins效应的天然橡胶进行循环加载,采用红外热像仪记录循环过程中天然橡...

Analysis of Torsional Tensile Thermal Effect of Natural Rubber at Different Temperatures

Thermoelastic refrigeration is a solid-state technology that produces a refrigeration effect by driving the phase change of thermoelastic materials with a stress field.Natural rubber has attracted much attention because of its price and low elastic modulus.In this study,vulcanized natural rubber was subjected to a stretching-twisting-untwisting-retraction cycle at an ambient temperature above 0℃to eliminate the Mullins effect.Natural rubber with the Mullins effect was subjected to cyclic loading in the ambient temperature range of-30-40℃.The temperature change of natural rubber during the cycle was recorded using an infrared thermal imager to explore the influence of temperature on the torsional tensile thermal effect.It was found that the temperature change of natural rubber during the twisting-untwisting process is greater than that in the simple stretching-retraction process.The temperature change is the highest due to the low-temperature crystallization characteristics of rubber at an ambient temperature of-20℃.The temperature during unloading reaches-41.3℃.